ROME (CNN) - Pope Francis is celebrating one of the most important days on the Christian calendar, Good Friday, at one of the most famous landmarks on Earth.

The Pontiff led a candlelit procession around the Colosseum, for the Way of the Cross ceremony.

The ceremony retraces the steps of Jesus carrying the cross to his crucifixion.

Pope Francis, known for his simplicity and humility, broke with tradition Thursday and washed the feet of young detainees at a youth detention center.

It's a tradition that mirrors Jesus' washing his disciples' feet.

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